Improvement in elevators



2 Sheets-Sheet1.

D. JENKINS.

Elevator.

No. 209,400. Patehte-d Oct. 29,1878.

Wilnewwi J? In I NJEIERS, FHOTO-LITHOGRAPHER, WASHINGTON D (:V

UNITED STATES PATENT OFFICE.

DAVID JENKINS, OF EVAN SVILLE, INDIANA.

IMPROVEMENT lN ELEVATORS.

Specification forming part of Letters Patent No. 209,400, dated October 29, 1878; application filed October 14, 1878.

To all whom it may concern:

Be it known that I, DAVID JENKINS, of Evansville, in the county of Vanderburg and State of Indiana, have invented new and useful Improvements in Elevators, of which the following is a specification:

The invention consists of an elevator so constructed with clamps and levers that, should the hoisting apparatus give way, the clamps will fasten themselves into the upright guidepieces, and thus prevent the elevator from fall- In the annexed drawings, making a part of this specification, Figure 1 is a front elevation, partly in section. Fig. 2 is a top elevation, partly in section. Fig. 3 is a side elevation, partly in section. Fig. 4 is a perspective view of the bell-crank lever. Fig. 5 is a sectional view of the coupling. Fig. 6 is a sectional view of the eccentric-wheel.

The same letters are employed in all the figures in the indication of identical parts.

A A are levers, constructed with an outer box and inner cylinder, which are hinged to the couplings D D. To the outer ends of these levers are attached the rods B B, by which the whole weight of the elevatonplatform and contents are suspended. The levers AA, on each side of the elevator, and embrac in g the upright guide-pieces G G, are connected by couplings D D, that fit over the upper ends of upright rods B B. These upright rods pass loosely through the couplings D D, so that in event of the sudden breaking of the hoistingrope no weight is suspended, except at the ends of the levers A A.

E E are rods, passing across the elevator through boxes on the under side of the levers A A. These boxes are divided into two chambers, E E. In the innerones, E E, are placed spiral springs E E so attached to the rods E E that when the rods are turned the springs will cause them to return to their original posit-ion. In the outer chambers, E E is an eccentric, E", with teeth on one side, so hung to the rods E E that the teeth will bear against the guides G 0, being turned by the springs E E when the strain on the hoisting-rope is relieved by its breaking.

F F are bell-crank levers, shaped as shown in Fig. 4. They have fulcrums formed by pins F F passing through the levers and the bifurcated arms F F into which they are set.

The arms 13 F are firmly bolted to the upright rods B B, forupon them come the whole weight of the elevator and contents while it is being justed they are held by means of the pins F I passing through the shell and screw. The lower ends of the links are attached to eyebolts F F in the rods E E, so that by moving the levers F F the rodsvare partially rotated and the eccentrics disengaged from the guides G O.

G is a chain or rope passing across the elevator, attached to the upper part of the levers F F, to which the hoisting-rope is made fast. As strain is brought on the hoisting-rope it draws the upper ends of the levers F F nearer together and forces the lower ends down, thus turning the rods E E, and also turning the eccenti ics E E attached to them, away from the guides; but should the hoisting apparatus break, the rods will be thrown back by the action of the springs E E, bringing the eccentrics to bear against the guides, and, as the whole weight of the elevator is then sustained by the rods B B at the extremity of the levers A A, the teeth of the eccentrics will be firmly fixed into the guides, and thus prevent it from falling.

WhatI claim as my invention, and desire to secure by Letters Patent, is-

1. In combination with the elevator-platform, the suspending-rods B B and levers or jointed arms AA, to which they are attached, and which serve as bearings for the oscillating shafts E E, as well as boxes for the springs and eccentrics by which the elevator is suspended on the guides in case of accident, substantially as set forth.

2. 'In combination with ways 0 G and chain G, the bell-crank levers F F, links F eyebolts F F, rods E, eccentrics E E and springs E substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DAVID JENKINS.

Witnesses T. 0. LOVE, JAMES Gaorrs. 

